Apparatus for press fitting a bushing on a shaft



y 1957 A. N. RABINOVICH ET AL 3,328,870

APPARATUS FOR PRESS FITTING A BUSHING ON A SHAFT I Filed July 20, 1965 Emmi United States Patent 3,328,870 APPARATUS FOR PRESS FITTING A BUSHING ON A SHAFT Avram Nalkhimovich Rabinovich, ul. Gogolya 7, kv. 9,

and Vladimir Sergeevich Matveichuk, ul. Gogolya 31,

kv. 40, both of Sevastopol, U.S.S.R.

Filed July 20, 1965, Ser. No. 473,474 Claims. (Cl. 29-200) This invention relates to apparatus for the fitting together of two components and more particularly to press fitting a bushing on a shaft employed in multi-station continuous machines.

Use is currently made of devices for fitting together two components, with such devices being in the form of a vibratory press incorporating means for the relative positioning of the parts to be fitted, and a working member capable of exerting a fitting force, in which oscillating motion is imparted to the working member in the direction of fitting.

The devices mentioned above have the means for the relative positioning of parts to be fitted immovable in relation to the vibratory working member in the course of fitting. When using such a device in continuous machines, the vibratory member can be moved together with parts to be fitted in the direction of interstation movement either continuously or intermittently, with such member periodically returning to the initial position after completing each fitting operation.

The above arrangement results in complicating the machine design since it is necessary to impart to the working member of the device either continuous or intermittent motion in the direction of interstation movement of the parts being fitted.

It is, therefore, an object of this invention to provide an apparatus for fitting a bushing on a shaft capable of being utilized in a multi-station continuous machine.

Another object of this invention is to provide an apparatus of the type described which is simple in design and reliable in operation, and which apparatus when incorporated in a multi-station machine does not complicate the structural details thereof.

With the foregoing and other objects in view, the present invention comprises a stationary table adapted to support a sloped cam and a roller in a pusher element supporting a push rod having a circular recess for holding the shaft and/or bushing in vertical alignment with the bushing and/or shaft, a gripper for gripping the bushing and/ or shaft above the shaft and/ or bushing, a working or pressing member located above the gripper, horizontally disposed spring means secured to the working or pressing member and an upright or standard on the table, and an electromagnet mounted diagonally between the spring means and the upright for oscillating the working or pressing member to effect a press fit between the bushing and the shaft.

Further objects and advantages of the invention will become more readily apparent to persons skilled in the art from the following detailed description and annexed drawings, and in which drawings:

FIGURE 1 is a diagrammatic view partly in elevation and partly in cross section of an apparatus embodying the present invention for effecting a press fit between a bushing and a shaft,

FIGURE 2 is a fragmentary view partly in cross section and partly in elevation illustrating the fitting of a bushing on a shaft supported by the push rod, and

FIGURE 3 is a view generally similar to FIGURE 2 showing the fitting of a shaft into a bushing supported by the push rod.

Referring to FIGURE 1, it will be seen that a working or pressing member 1 which is elongated viewed in the direction of interstation movement of the components to be fitted as indicated by arrow B in FIGURES 2 and 3, is secured by means of horizontally extending flat springs 2 to an upright 3 which is suitably secured at its lower end to a stationary table 14. An electromagnet structure 4 is fixed diagonally between the springs 2 and the upright 3 and such electromagnet structure functions to impart oscillating movement to the working member 1, as indicated by arrow A.

The mechanism for achieving the relative positioning of the parts to be fitted is installed on a movable member efiecting the interstation movement of such parts. More particularly, such means includes a push rod 5 and a gripper 6 which are mounted on movable members 9 and 10, respectively, of the machine. As shown in FIGURES 1 and 2, the parts to be fitted are a shaft 7 and a bushing 8, with the bushing 8 being removably carried by the member 10 and the shaft 7 is positioned in a circular recess provided in the upper end of the push rod 5.

The push rod 5 is positioned in a recess formed in the member 9 so as to be capable of axial movement along the center line of the shaft and bushing. More particularly, the push rod is coaxially disposed within a pusher 11 and a spring normally maintains the push rod 5 in the position shown in FIGURE 3. A roller 12 is provided adjacent the lower end of the pusher l1 and is adapted to coact with a sloped cam 13 which is fixed in position on the stationary table 14.

While the operation of the apparatus is believed to be readily apparent from the foregoing, it may be summarized as follows. After positioning the shaft 7 in the push rod and the bushing 8 on the gripper 6 movement is imparted to the machine. The roller 12 while traveling over the sloped cam 13 imparts axial movement to the pusher 11 in the direction shown by arrow C in FIGURE 2 thereby moving the push rod 5 upwardly against the action of the spring. At the same time, the bushing 8 slides in the gripper 6 traveling in the same direction until it makes contact with the working or pressing member 1 which is being oscillated due to the electromagnet structure 4, thereby effecting a press fit between the bushing and shaft.

Frictional force F resulting from the coaction between the working member 1 and the bushing 8 does not exert any pronounced influence upon the fitting process due to the short-time action of the working member upon the bushing by virtue of the oscillating motion.

When the abovesaid process is terminated, the parts thus fitted leave, due to the interstation movement, the working zone of member 1 and, being set free from gripper 6, can be transferred for the next working operation.

The process of fitting bushing 8' with shaft 7' (FIG. 3) is identical to that described hereinabove.

The invention is not to be confined to any strict conformity to the showings in the drawings but changes or modifications may be made therein so long as such changes or modifications mark no material departure from the spirit and scope of the appended claims.

What we claim is:

1. An apparatus for assembling and securing a bushing member upon a shaft member, including a stationary table, a pusher mounted for axial movement above the table, a push rod supported by the pusher, a sloped cam on the stationary table, a roller on the pusher adapted to ride up the cam to move the pusher and push rod axially, said push rod having a circular recess for holding one of the members, a gripper for gripping the other of the members above the first member in vertical alignment therewith, a working member above the gripper,

an upright on the stationary table, horizontally extending spring means secured to the working member and upright, respectively, and electromagnet means mounted diagonally between the spring means and the upright for oscillating the working member to press fit the bushing member and shaft member together when the pusher rides up the sloping cam to move the pusher and push rod axially to bring the bushing and shaft members into cooperative relationship.

2. The apparatus as claimed in claim 1 in which said push rod and gripper hold and grip the shaft member and bushing member, respectively.

3. The apparatus as claimed in claim 1 in which said push rod and grip-per hold and grip the bushing member and shaft member, respectively.

4. An apparatus for mating a bushing member with a shaft member, comprising a stationary member, at least one movable base mounted on said stationary member, means for relative orientation of the bushing member and shaft member mounted on said movable base and capable of moving together with said base in a direction perpendicular to that of the bushing member and shaft member, a working element arranged above said means for relative orientation of the bushing member and shaft member including a resilient connection with said stationary member vibrating in the direction of the mating of the bushing member and shaft member and developing a force effecting mating of the bushing member with the shaft member, and said working element being elongated in the direction of said means for relative orientation of the bushing member and shaft member.

5. The apparatus as claimed in claim 4 in which said working element is of a length not less than the length of the zone of its interaction with the mating bushing member and shaft member during movement of the latter in a direction perpendicular to the direction of mating.

6. The apparatus as claimed in claim 4- in which said means for relative orientation of the bushing member and shaft member includes a first device for fastening thebushing member and a second device for fastening the shaft member so arranged relative to one another that during mating, the geometrical axis of the mating surfaces of the bushing member and shaft member are located on one straight line, and at least one of said devices being mounted for moving in the direction of mating between the bushing member and shaft member.

7. The apparatus as claimed in claim 6 in which the movement of at least one of said devices in the direction of mating is effected by a push rod arranged in the movable base coaxially with the bushing member and shaft member, and a cam secured to the stationary. member with which said push rod coacts.

S. An apparatus for mating a bushing member with a shaft member, comprising a stationary member, two movable bases mounted on said stationary member and arranged one above the other, means for relative orientation of the bushing member and shaft member including a first device for fastening the bushing member mounted on one movable base and a second device for fastening the shaft member mounted on the other movable base with said devices being capable of moving together with said bases in a direction perpendicular to the direction of mating of the bushing member and shaft member, said first and second devices being so arranged relative to one another that during mating, the geometrical axes of the mating surfaces of the bushing member and shaft member are located on one straight line, with at least one of said devices being mounted for moving in the direction of mating between the bushing member and shaft member, a working elements arranged above said means for relative orientation of the bushing member and shaft member, including a resilient connection with said stationary member vibrating in the direction of the mating of the bushing member and shaft member and developing a force effecting mating of the bushing member with a shaft member, and said Working element being elongated in the direction of said devices for fastening the bushing member and shaft member.

9. The apparatus as claimed in claim 8 in which said working element is of a length not less than that of the mne of its interaction with the mating bushing member and shaft member during movement of the latter in a direction perpendicular to the direction of mating.

10. The apparatus as claimed in claim 8 in Which the movement of one of said devices is effected by a push rod arranged in the movable base associated therewith coaxially with the bushing member and shaft member, and a cam secured to the stationary member with which said push rod coacts.

References Cited UNITED STATES PATENTS 3,191,279 6/ 196-5 Ashurkoff 29--200 3,224,086 12/1965 Balamuth 29-625 JOHN F. CAMPBELL, Primary Examiner.

THOMAS H. EAGER, Examiner. 

1. AN APPARATUS FOR ASSEMBLING AND SECURING A BUSHING MEMBER UPON A SHAFT MEMBER, INCLUDING A STATIONARY TABLE, A PUSHER MOUNTED FOR AXIAL MOVEMENT ABOVE THE TABLE, A PUSH ROD SUPPORTED BY THE PUSHER, A SLOPED CAM ON THE STATIONARY TABLE, A ROLLER ON THE PUSHER ADAPTED TO RIDE UP THE CAM TO MOVE THE PUSHER AND PUSH ROD AXIALLY, SAID PUSH ROD HAVING A CIRCULAR RECESS FOR HOLDING ONE OF THE MEMBERS, A GRIPPER FOR GRIPPING THE OTHER OF THE MEMBERS ABOVE THE FIRST MEMBER IN VERTICAL ALIGNMENT THEREWITH, A WORKING MEMBER ABOVE THE GRIPPER, AN UPRIGHT ON THE STATIONARY TABLE, HORIZONTALLY EXTENDING 